Siemens SIMATIC S5 Manual page 129

Data Exchange with the Central Controller
Message 18
This message contains the manipulated variables of controllers 0 to 12. The output is in the form
of a percentage. The following assignments apply:
Range 0 x
Range 101 x
Range 128 x
Range 229 x
Fig. 2.5/2 Structure of message 18
(manipulated variables)
4–62
100 => heating at x%
127 => range not permitted (does not occur)
228 => cooling at x – 128%
65535 => range not permitted (does not occur)
IP244
C79000–B8576–C860–02